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The M4A1 carbine is a fully automatic variant of the basic M4 carbine. The M4A1 was developed in May 1991 and entered service in 1994; starting in 2014 the U.S. Army began upgrading all of its existing M4s to the M4A1 standard. [69] The M4A1 was the first M4 model with the removable carry handle.
M4A1 (cast hull). Note the rounded edges of its fully cast upper hull. Variants from the M4 and M4A1 share the same 9-cylinder radial engine profile. M4A2 M4A2 HVSS. M4A3E2 "Jumbo" with an extra inch of cast armor in the frontal hull. M4A3E8 "Easy Eight" at the Patton Museum of Cavalry and Armor, 2003. M4A4.
M4A1: 5.56×45mm NATO rifle (produced under contract from the U.S. Government since 2013 by FNH USA). [9] Mle 1930: Belgian variant of the Browning M1918, chambered in 7.65×53mm Belgian Mauser. Model 1949: Semi-automatic rifle / selective fire automatic rifle chambered in .30-06 Springfield, 7.92×57mm Mauser, 7.62×51mm NATO, and 7×57mm Mauser.
In November 1943, several M4A1 Shermans were tested at the American proving ground to test British innovations. On one of them, 37 experimental changes were made, on the second – 47, on the third – 53. In total, 60 changes were developed and implemented for the Shermans, most of which were considered successful after a 600-mile run and firing.
Future standard service rifle, replacing the M4A1 for close combat forces. Winner of the NGSW program in April 2022. [8] M4A1: 5.56×45mm NATO: Assault rifle, Carbine United States: Standard service rifle. To be partially replaced by the XM7, winner of the Next Generation Squad Weapon Program [9] Mk 17 Mod 0: 7.62×51mm NATO: Battle rifle ...
The Special Operations Peculiar MODification (SOPMOD) kit is an accessory system for the M4A1 carbine, CQBR, FN SCAR Mk 16/17, HK416 and other weapons used by United States Special Operations Command (USSOCOM) special forces units, though it is not specific to SOCOM.
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Canada created a prototype anti-aircraft vehicle with four 20 mm Polsten cannons mounted in a turret on Canadian-made M4A1 hull, which was called Skink. The Soviets reportedly replaced the US 75 mm gun on some M4A2s with the 76.2mm F-34 gun of the T-34 medium tank to create the M4M; they discontinued the practice when assured of US ammunition ...